(function (doc, win) {
 
	    var docEl = doc.documentElement,
	 
	        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
	 
	        recalc = function () {
	 
	            var clientWidth = docEl.clientWidth;
	 
	            if (!clientWidth) return;
	 
	                docEl.style.fontSize = 100 * (clientWidth / 1080) + 'px';
	 
	            };
	 
	            if (!doc.addEventListener) return;
	 
	            win.addEventListener(resizeEvt, recalc, false);
	 
	            doc.addEventListener('DOMContentLoaded', recalc, false);
	 
	})(document, window);
